Born on Feb. 2, 2014, Alena Rose is the oldest Jonas girl. Since the Jonas Brothers' revival in May 2019, she's been her dad's biggest groupie, congratulating him and her uncles, Nick and Joe, for getting MTV VMAs nominations and giving him smooches at his concerts. But perhaps the cutest father-daughter moment so far came on Alena's first day of Kindergarten. In a post to Instagram featuring a photo of Alena holding up a sign that read, "Alena begins Kindergarten 2019," he wrote: "My big girl on her first day of Kindergarten. I'm not prepared for this!!!" So sweet!